Jest is a delightful JavaScript Testing Framework with a focus on simplicity.
Jest
Jest is a delightful JavaScript Testing Framework with a focus on simplicity.
Test Utilities – React
import ReactTestUtils from 'react-dom/test-utils'; // ES6 var ReactTestUtils = require('react-dom/test-utils'); // ES5 with npm Overview ReactTestUtils makes it easy to test React components in the testing framework of your choice. At Facebook we use Jest for painless JavaScript testing. Learn how to get started with Jest through the Jest website’s React Tutorial. Note: We recommend using React Te
Tracking unhandled rejected Promises
In Promise-based asynchronous code, rejections are used for error handling. One risk is that rejections may get lost, leading to silent failures. For example: function main() { asyncFunc() .then(···) .then(() => console.log('Done!')); } If asyncFunc() rejects the Promise it returns then that rejection will never be handled anywhere. Let’s look at how you can track unhandled rejections in browsers
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